Effects of yttrium ion doping on electrochemical performance of LiFePO4/C cathodes for lithium-ion battery
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  • 作者:Junming Chen ; Xuchun Wang ; Zhipeng Ma ; Guangjie Shao
  • 关键词:Lithium ; ion battery ; Lithium iron phosphate ; Yttrium ion doping ; High rate
  • 刊名:Ionics
  • 出版年:2015
  • 出版时间:October 2015
  • 年:2015
  • 卷:21
  • 期:10
  • 页码:2701-2708
  • 全文大小:1,667 KB
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  • 作者单位:Junming Chen (1)
    Xuchun Wang (1)
    Zhipeng Ma (2) (3)
    Guangjie Shao (2) (3)

    1. College of Chemistry and Materials Engineering, Anhui Science and Technology University, Fengyang, 233100, China
    2. State key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China
    3. Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, China
  • 刊物类别:Chemistry and Materials Science
  • 刊物主题:Chemistry
    Electrochemistry
    Materials Science
    Physical Chemistry
    Condensed Matter
    Renewable Energy Sources
    Electrical Power Generation and Transmission
  • 出版者:Springer Berlin / Heidelberg
  • ISSN:1862-0760
文摘
The olivine-type LiFe1-x Y x PO4/C (x--, 0.01, 0.02, 0.03, 0.04, 0.05) products were prepared through liquid-phase precipitation reaction combined with the high-temperature solid-state method. The structure, morphology, and electrochemical performance of the samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy-dispersive spectroscopy (EDS), galvanostatic charge-discharge, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). We found that the small amount of Y3+ ion-doped can keep the microstructure of LiFePO4, modify the particle morphology, decrease charge transfer resistance, and enhance exchange current density, thus enhance the electrochemical performance of the LiFePO4/C. However, the large doping content of Y3+ ion cannot be completely doped into LiFePO4 lattice, but existing partly in the form of YPO4. The electrochemical performance of LiFePO4/C was restricted owing to YPO4. Among all the doped samples, LiFe0.98Y0.02PO4/C showed the best electrochemical performance. The LiFe0.98Y0.02PO4/C sample exhibited the initial discharge capacity of 166.7, 155.8, 148.2, 139.8, and 121.1 mAh g? at a rate of 0.2, 0.5, 1, 2, and 5 C, respectively. And, the discharge capacity of the material was 119.6 mAh g? after 100 cycles at 5 C rates. Keywords Lithium-ion battery Lithium iron phosphate Yttrium ion doping High rate

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